Seiko Prospex "Baby Tuna" Automatic Diver's 200M Ratio Black Leather SRP641K1-LS2 Men's WatchStronger, bolder and sexier, the 2015 Baby Tuna is more interesting too! A great sports watch that doesn’t cost an arm and a leg and doubles up as a wonderful beater. The best mechanical bang you can get for your buck in the category, it’s a style that starts growing on you immediately after you lay your hands on it. In simple words, it’s a cool, fun watch.